permanent -
continuing or enduring without marked change in status or condition or place; "permanent secretary to the president"; "permanent address"; "literature of permanent value"
unchangeable not changeable or subject to change; "a fixed and unchangeable part of the germ plasm"-Ashley Montagu; "the unchangeable seasons"; "one of the unchangeable facts of life"
permanent -
Lasting for an indefinitely long time.
Wikipedia
The permanent of a square matrix is a function of the matrix similar to the determinant. The permanent, as well as the determinant, is a polynomial in the entries of the matrix. Both permanent and determinant are special cases of a more general function of a matrix called the immanant.
OmegaWiki Dictionary
Ω
permanent Without break, cessation or interruption.